Color-base for leather-finishes and method of making the same



' UNETEE STATES Jenn .H. r rmesrnn,

eatenr oertca.

OF MILWAUKEE, WISCONSIN, ASSIGNOR TO PRESTO COLbR comm, or cunanr,WISCONSIN.

mmB-BASE FOR LEATHEEFINISHES METHOD OF MAKING THE SAIlHE.

, eases-z,

Ho Drawing.

necessary to apply different surface finishes to give the requisitecolors, etc. In the past these have been made up in l1qu1d form, areverv bulky. expensive'to transport, and are for the main part easilyputrescible as they contain binders consisting of gelatin, casein, andsimllar animal and vegetable products which decompose very rapidly,consequently it is necessary to put in preservatives such as arsenic,oil of mirbane, etc., which ar dangerous to the workers unless used invery minute quantities and in some cases are foul smelling.

The leather finishes as heretofore sold contain approximately 80 percent. of water. It is in paste form containing allthe essentials of theleather finish with the exception ofthe water and the binder. I am thusenabled to get a concentrated base of a concentration of at least ten toone. One gallon of my invention will make the color base for ten gallonsof finish. It is easy to handle, does not leak, need not he hermeticallysealed, will not freeze, and contains no substantial amount of activepoisonous preservative.

With these and other objects in view my invention consists in thefollowing combination of ingredients. I have found that itis impracticalto make a color base for finishing leather in paste form following themethods heretofore in use. It is imperative that the colors be veryfinelv ground so as to be finely pulverulent. This cannot beaccomplished by ordinary means by grinding in water as a suflicientdegree of pulverization cannot be obtained. Neither can itaccomplishedby grinding in oil as is the case in paints. as the finish must be usedby mixmg with water. and oil and water are practically immiscible. Ihave therefore discovered that by using a combination of a sulfonatedoil such as Turkey red oil, which Specification of Letters Patent.

Patented @ct. til, 1921.

Application filed ma as, 1921. Serial no. 473,361.

is water soluble, thinned somewhat with water, will giye me a practicalgrinding vehlcle )VlllCll will not only enable me to grind my pigmentsto the proper degree of fineness .but will also give me a resultantproduct which as to the vehicle is water soluble. The vpigments beingvery finely divided are easily held in suspension when in use, they arealmost in a colloid condition.

In preparing my base for leather finish I take a suitable mixture ofpigments which wlll give me the desired shade, such for instance aschrome yellowten pounds, French ocher-t-wo pounds. This is then mixedwith three pounds of water and three pounds of sulfonated oil and groundto an extremely fine consistency in an ordinary painters stone mill. Thematerial is then ready for packing and I may either pack ,it in tinc'ontainers and sterilize the container, including the contents. or mayadd a very small amount of preservative such as l/lOOth of one per cent.of mercuric chlorid to prevent the forming of mold. Paradoxical as itmay seem, I have found that this product when made up is subject to moldand I have finally discovered that l/lOOth of one per cent. of mercuricchlorid will counteract the tendency of mold and give aperfectly stableproduct. The product so prepared is-ready for use by simply mixing withwater and a binder, such as Irish moss, casein, blood albumin, shellacetc., and is of course to be kept constantly agitated as is customarilydone with all finishes of this sort.

My invention has the advantages of permanency, safety. extremeconcentration, freedom from freezing, from putrescing, saving in bulk,may be made up in exact amounts as wanted by the purchaser, is odorless,and containsoxidizing agents, 5. e., a sulfonated oil. which gives thepaint-like characteristic to the mixture, 2'. 0., itdries by oxidationand not by evaporation and at the same time it is water soluble.

. Having fully disclosed my invention, 1 claim:

1. A concentrated color base suitable for making leather finishes whichconsists of a pigment and a water soluble oil, the pigment being sofinely divided as to be in substantially a colloid condition whendiluted with water.

. 2. A concentrated color base suitable for making leather finishes,which consists of a finely ground pigment, water soluble oil, and water,and a preservative against mold. 3. A concentrated color base suitablefor 5 making leather finishes, which consists of a finely groundpigment, water soluble oil, and water,- and containing a small amount ofmercuric chlorid.

4. The method of preparing a pigment colorbase for leather finisheswhich consists in grindin the pigment in a solution of a water solu leoil and water to pulverulent form, putting the same in containers andsterilizing the containers and contents 15 thereof.

5. The method of preparing a pigment color base for leather finisheswhich consists in grindin the pigment in a solution of a Water solufileoil and water to ulverulent form, and adding a preservative against lh hd f i 6. e met 0 o preparin a pi ent color base for leather finisheswhich c onsists in grinding the of a sulfonated oil and water topulverulent form, puttin the same in containers and sterilizing t econtainers and contents thereof.

JOHN H. PFINGSTEN.

pigment in a solution

